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Kids whose moms encourage them to exercise and eat well, and model those healthy behaviors themselves, are more likely to be active and healthy eaters, according to researchers at Duke Medicine.

Their findings, published online in the International Journal of Obesity this month, remind parents that they are role models for their children, and underscore the importance of parental policies promoting physical activity and healthy eating.

Exercise and healthy diets are critical in fighting childhood obesity, a considerable problem in the United States, where over a quarter of kids ages two to five are already overweight or obese.

“Obesity is a complex phenomenon, which is influenced by individual biological factors and behaviors,” said study author Truls Ostbye, M.D., PhD, professor of community and family medicine at Duke. “But there are variations in obesity from one society to another and from one environment to another, so there is clearly something in the environment that strongly influences the obesity epidemic.”

The home environment and parenting can influence a child’s health by shaping dietary and physical behaviors, such as providing access to fruits and vegetables or encouraging kids to play outside.